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Micro-electronic balances should be preheated in accordance with the requirements of the instructions before use, and sufficient warm-up time can be achieved. The working principle of the micro-electronic balance is balance. Once unbalanced, the balance is pulled back by the electromagnetic force. When the microelectronic balance is in the warm-up phase, with the increase of the internal temperature, B will gradually decrease, and I will also decrease. This will cause F to become smaller, the balance will lose balance, and the indication will appear positive. The direction of drift. Only after sufficient preheating, the magnets reach the thermal equilibrium. At the end of this change process, the electronic balance will reach equilibrium.
In addition, micro-electronic balances generally do not have power switches like those of normal appliances. As long as the micro-balance is powered on, no display is displayed, and the balance is already in a warm-up state. The "ON/OFF" button on the electronic balance is only the switch of the display. Therefore, the balances that are frequently used do not need to unplug the power supply, especially high-precision balances. Under conditions permitting, long-term continuous electrical energy keeps the electronic balance always warm. If the temperature difference between the sample and the container and the balance weighing chamber is in the temperature difference, a weighing error will occur. In addition, the hand temperature will affect the weighing of the electronic balance, and the weighing error caused by human factors should be reduced as much as possible. For samples with hygroscopicity and volatility, weigh them as soon as possible to shorten the weighing time, or weigh the samples in a closed container.
Second, carefully calibrate the microelectronic balance according to the instructions before use
In previous tests (tests), we found that the first-time weighing test on an electronic balance was very inaccurate due to the fact that most electronic balances were not calibrated for a long time and many users considered themselves as electronic balances. Zero can be directly measured. Zhongyi HSBC Technology Co., Ltd. prompts you to display the zero point on the microelectronic balance. It does not mean that the accuracy of the data weighed by the balance is in compliance with the test standard, and it only represents the zero stability of the balance. Therefore, to determine whether an electronic balance is qualified, it is necessary to comprehensively consider the conformity of other technical indicators. Electronic balances have to be calibrated before the use of electronic balances for long storage times, moving positions, environmental changes, and rapid temperature changes, in order to ensure the accuracy of the weighing results. The electronic balance calibration method is usually divided into Internal calibration and external calibration.
Some users believe that the heavier the objects weighed within the range of the microelectronic balance, the greater the damage to the balance. This understanding is wrong. The maximum safety load of an instrument is usually the maximum static load it can withstand without causing permanent changes in its metering performance. Since the microelectronic balance uses the principle of electromagnetic force automatic compensation circuit, when the weighing pan is loaded (within the premise of not exceeding the weighing range), the electromagnetic force will push the weighing pan back to the original equilibrium position, so that the electromagnetic force and weighing The gravity balance of the object, as long as the weighing in the allowable weighing range, the impact of the size of the object on the balance is very small, will not affect the accuracy of microelectronic balance due to long-term weighing, the principle is weighing The object is within the weighing range.
Preparation of microelectronic balances before use
First, warm up